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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information Related to Share-Based Compensation Plan Cost
The following table provides information related to UAL's share-based compensation plan cost for the years ended December 31 (in millions):
 
 
2018
 
2017
 
2016
Compensation cost:
 
 
 
 
 
 
RSUs
 
$
98

 
$
63

 
$
58

Restricted stock
 
2

 
8

 
11

Stock options
 
1

 
2

 
1

Total
 
$
101

 
$
73

 
$
70
Summary of Unearned Compensation and Weighted-Average Remaining Period to Recognize Costs
The table below summarizes UAL's unearned compensation and weighted-average remaining period to recognize costs for all outstanding share-based awards that are probable of being achieved as of December 31, 2018 (in millions, except as noted):
 
 
Unearned Compensation
 
Weighted-
Average
Remaining Period
(in years)
RSUs
 
$
66

 
1.6
Stock options
 
2

 
2.6
Total
 
$
68

 
 
Summary of RSU and Restricted Stock Activity
The table below summarizes UAL's RSUs and restricted stock activity for the years ended December 31 (shares in millions):
 
 
Liability Awards
 
Equity Awards
 
 
RSUs
 

RSUs
 
Weighted-
Average
Grant Price
 
Restricted 
Stock
 
Weighted-
Average
Grant Price
Outstanding at December 31, 2015
 
2.6

 
—

 
$
—

 
0.3

 
$
48.68

Granted
 
1.0

 
0.9

 
51.60

 
0.4

 
50.63

Vested
 
(1.4
)
 
—

 
—

 
(0.1
)
 
41.47

Forfeited
 
(0.1
)
 
(0.1
)
 
50.57

 
(0.1
)
 
53.42

Outstanding at December 31, 2016
 
2.1

 
0.8

 
51.67

 
0.5

 
52.00

Granted
 
0.6

 
1.0

 
71.68

 
—

 
—

Vested
 
(0.7
)
 
(0.3
)
 
51.81

 
(0.2
)
 
51.60

Forfeited
 
(0.2
)
 
(0.1
)
 
57.49

 
—

 
—

Outstanding at December 31, 2017
 
1.8

 
1.4

 
63.99

 
0.3

 
52.30

Granted
 
0.7

 
1.1

 
67.74

 
—

 
—

Vested
 
(0.5
)
 
(0.5
)
 
63.02

 
(0.2
)
 
53.24

Forfeited
 
(0.1
)
 
(0.2
)
 
67.34

 
—

 
—

Outstanding at December 31, 2018
 
1.9

 
1.8

 
66.29

 
0.1

 
51.17